MATLAB: Passing data from custom modal dialog box to main GUI

modal

I am trying to pass data from a modal dialog box to a main GUI. When I run the code at 'full speed' as interpreted code, the main GUI tells me that a specific variable (handles.cancelPT) is not defined (assigned to the main GUI handles structure by the modal dialog box). When I run in debug mode (step by step) no error occurs.
Relevant main GUI code:
function performanceandthicknessmenu_Callback(hObject, eventdata, handles)
% Call dialog box for entering data to process; Wait for dialog box to close.
modelbyperformanceandthicknessdialog; uiwait(gcf);
if handles.cancelPT == true
    msgbox('Operation cancelled')
elseif handles.cancelPT == false
    % Executes when there is some data to calculate when optimizing by
    % performance and thickness
    handles.frequencyGHz
    handles.loss
    handles.minimumThicknessInches
    handles.maximumThicknessInches
    handles.angleOfIncidenceDegrees
    handles.polarization
    handles.absorptionMode
end
guidata(hObject, handles);
Relevant modal dialog box code:
function cancelpushbutton_Callback(hObject, eventdata, handles)
handles.cancelPT = true; % Canceled
close(gcf);
% Pass handles data on to engineering part chooser
guidata(findobj('tag', 'engineeringpartchooser'), handles);
Any pointers would be appreciated.

Best Answer

You should not be counting on gcf to refer to the correct object.
In the cancel routine, instead of
close(gcf)
use
close(ancestor(hObject,'figure'))
Your modal dialog modelbyperformanceandthicknessdialog should not allow the calling routine to resume until the dialog is closed. The modal routine itself should do the uiwait(), not your calling code.
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